Makefile: move all Power Architecture boards into boards.cfg

Clean up Makefile, and drop a lot of the config.mk files on the way.

We now also automatically pick all boards that are listed in
boards.cfg (and with all configurations), so we can drop the redundant
entries from MAKEALL to avoid building these twice.

Signed-off-by: Wolfgang Denk <wd@denx.de>
diff --git a/include/configs/ELPT860.h b/include/configs/ELPT860.h
index 0f56302..99d0eb1 100644
--- a/include/configs/ELPT860.h
+++ b/include/configs/ELPT860.h
@@ -47,6 +47,8 @@
 #define CONFIG_MPC860T		1
 #define CONFIG_ELPT860		1	/* ...on a LEOX's ELPT860 CPU board */
 
+#define CONFIG_SYS_TEXT_BASE	0x02000000
+
 #define CONFIG_8xx_CONS_SMC1	1	/* Console is on SMC1		    */
 #undef	  CONFIG_8xx_CONS_SMC2
 #undef	  CONFIG_8xx_CONS_NONE